A high-accuracy optical clock via three-level coherence in neutral bosonic ${}^{88}$Sr

Abstract

An optical atomic clock scheme is developed that utilizes two lasers to establish coherent coupling between the $5s^2{}^1{S}_0$ ground state of ${}^{88}$Sr and the first excited state, $5s5p{}^3{P}_0$. The coupling is mediated by the broad $5s5p{}^1{P}_1$ state, exploiting the phenomenon of electromagnetically induced transparency. The effective linewidth of the clock transition can be chosen at will by adjusting the laser intensity. By trapping the ${}^{88}$Sr atoms in an optical lattice, long interaction times with the two lasers are ensured; Doppler and recoil effects are eliminated. Based on a careful analysis of systematic errors, a clock accuracy of better than $2\times 10^{-17}$ is expected.

4 pages, 3 figures

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